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Thread: Exposure using Crop Lense on FF

  1. #1

    Default Exposure using Crop Lense on FF

    Hello,

    Need some help on a particular situation, hope i phrase it correctly.

    If you are using Crop Lense on FF body,
    depending on Lense / Settings, you may or may not have serious vignetting.

    Assuming there is very serious vignetting and you are using FF mode (not Crop Mode),
    Will the serious vignetting cause the camera body to give an incorrect exposure setting, assuming you are using Matrix Exposure mode ?
    I suppose for Crop Mode, it will not impact exposure, same for FF Mode in Spot & Center-Weighted.

    Thanks

  2. #2
    Moderator daredevil123's Avatar
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    Default Re: Exposure using Crop Lense on FF

    Quote Originally Posted by human1969 View Post
    Hello,

    Need some help on a particular situation, hope i phrase it correctly.

    If you are using Crop Lense on FF body,
    depending on Lense / Settings, you may or may not have serious vignetting.

    Assuming there is very serious vignetting and you are using FF mode (not Crop Mode),
    Will the serious vignetting cause the camera body to give an incorrect exposure setting, assuming you are using Matrix Exposure mode ?
    I suppose for Crop Mode, it will not impact exposure, same for FF Mode in Spot & Center-Weighted.

    Thanks
    It might... but there is no definite. it all depends on the algorithm of matrix metering in your specific cam. The scene in question also matters. It also matters where your selected AF point is, because for some cameras, there is some weight assigned to the AF point even in matrix metering.

  3. #3

    Default Re: Exposure using Crop Lense on FF

    Quote Originally Posted by daredevil123 View Post
    It might... but there is no definite. it all depends on the algorithm of matrix metering in your specific cam. The scene in question also matters. It also matters where your selected AF point is, because for some cameras, there is some weight assigned to the AF point even in matrix metering.
    Make sense....that means have to use center-weighted to be safe.

    Thanks !

  4. #4
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    Default Re: Exposure using Crop Lense on FF

    Sorry im noob but does this only apply to Nikon cameras? Since they all dont have stuff like EFS or EF?

  5. #5

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    Quote Originally Posted by Ev0lutionz View Post
    Sorry im noob but does this only apply to Nikon cameras? Since they all dont have stuff like EFS or EF?
    It applies to all cameras that allow the crop lenses to be mounted on a ff camera. It will also apply to the Canon lenses where the rear elements don't interfere with the mirror, though in general it's a bloody pain on canon
    Alpha

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    Moderator daredevil123's Avatar
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    Default Re: Exposure using Crop Lense on FF

    Quote Originally Posted by Ev0lutionz View Post
    Sorry im noob but does this only apply to Nikon cameras? Since they all dont have stuff like EFS or EF?
    Actually Nikon has something similar to EFS and EF... it is called DX and FX. Just that Nikon does not specifically design it to prevent the use of DX lenses on FF bodies.

  7. #7
    Moderator Octarine's Avatar
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    Default Re: Exposure using Crop Lense on FF

    Quote Originally Posted by Ev0lutionz View Post
    Sorry im noob but does this only apply to Nikon cameras? Since they all dont have stuff like EFS or EF?
    Nikon has DX and FX. Mount a DX lens on an FX body and you have the same effect. The difference is that Nikon FX can be adjusted to work with DX lens, the sensor uses a smaller, DX-sized area only. Thus, it avoids vignetting.
    EOS

  8. #8
    Senior Member shierwin's Avatar
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    Default Re: Exposure using Crop Lense on FF

    Canon EF-S lenses cannot be mounted on Canon FF bodies without modification; and the mirror may hit the rear of the EF-S lens

  9. #9
    Moderator Octarine's Avatar
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    Default Re: Exposure using Crop Lense on FF

    Quote Originally Posted by shierwin View Post
    Canon EF-S lenses cannot be mounted on Canon FF bodies without modification; and the mirror may hit the rear of the EF-S lens
    Canon EF-S equivalent third party lenses (e.g. Tamron 17-50, Sigma 10-20) do not have this protruding back. They can be mounted on any FF body without mirror issue - but the mechanical vignetting is severe.
    EOS

  10. #10
    Senior Member shierwin's Avatar
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    Default Re: Exposure using Crop Lense on FF

    Quote Originally Posted by Octarine View Post
    Canon EF-S equivalent third party lenses (e.g. Tamron 17-50, Sigma 10-20) do not have this protruding back. They can be mounted on any FF body without mirror issue - but the mechanical vignetting is severe.
    So Desu...

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